Brake shoe mounting



Patented July 3, 1934 UNETED BRAKE SHOE MOUNTING Application January 25, 1933, Serial No. 653,353

EPATENT GFFIfiE i Claims.

This invention relates to brake shoe mountings and it has for its object to provide novel means for securing the shoe in fixed position on the head, thereby preventing wear of contacting parts of the shoe and the head on which it is mounted which results when the shoe is capable of vibrating independently of and of moving relative to the head, and prolonging the life and service of the shoe.

In the accompanying drawing illustrating a selected embodiment of the invention,

Fig. 1 is a longitudinal sectional View of a shoe and head embodying the invention.

Fig. 2 is a sectional View on the line 2-2 of i Fig. 1.

Fig. 3 is a sectional view similar to Fig. 2 showing the boss extending to the side walls of the head.

Referring to the drawing, 4 is a brake shoe hav- 1 ing an attaching lug 5, end lugs 6 and end guides 7. The brake shoe may be of any desired construction and it is preferably provided with a reenforcing back 8 to hold the parts of the body of the shoe together in case of fracture.

The brake head 9 has a face plate 10, a recess 11 to receive the attaching lug 5, sides 12, and a back plate 13. The face plate and the back plate are connected by the side plates and also by webs 14 at each side of the recess 11. The face plate and the back plate are spaced apart and the webs 14 are provided with openings 15 to form a keyway 16 extending throughout the length of the head and also through the attaching lug of the shoe to receive the fastening key 1'7. Bosses 18 are provided on the inner side of the face plate 10 between the webs l4 and the ends of the head and another boss 19 is preferably provided on the inner side of the back plate.

When the shoe is arranged in position on the ;head, the key is driven into place in the keyway, the end of the key engaging the inclined face 20 of the boss 19 to deflect said end and insure retention of the key fastening position. ThE attaching lug is preferably provided with a reenforcing metal strap 21 which constitutes the upper wall of the key opening in the lug, this being a familiar construction in the art. One side of the key engages the lug strap and the opposite side of the key engages the bosses 18 and these parts are so con- "structed and arranged that the key is flexed between the bosses and tightly engages therewith and with the lug strap and securely holds the shoe on the head with the back of the shoe in snug contact with the face plate of the head. The

' "ends of the head are forked in the usual manner to engage on opposite sides of the end guides and they also are arranged to engage the end lugs, which are standard'construction of brake shoes, but these end lugs are not essential to my invention because it provides for flexing the key so that it will hold the shoe rigidly in place on the head and thereby prevent independent vibration of the shoe and relative movement of the shoe on the head.

It is customary to make shoes with a cast iron body and with cast iron projections at the sides of the lug strap to form therewith the attaching lug; and it is also customary to make the heads of cast iron or malleable iron and sometimes of manganese steel. It is necessary to provide some tolerance between the contacting parts to insure easy fitting and consequently the shoe may be capable of slight endwise movement on the head, for which reason it may be found desirable to provide the end lugs 6, but with my invention the key holds the shoe so tightly on the head that the vibration of the shoe and the wear of contacting parts which has been customary heretofore is practically eliminated and consequently the shoe will remain centered in its proper position on the head until it is Worn out. By thus securing the shoe in fixed position on the head, independent vibration of the shoe is also practically eliminated and this prevents the reenforcing back from breaking and enables it to hold the parts of the body together in case of fracture until the shoe is worn out in service. When the key is driven into the keyway, the end thereof engages the incline 20 which guides the end of the key over the boss 19 and this boss holds the end of the key flexed over the boss 18 and under the boss 19 and not only adds to the rigidity with which the shoe is held on the head but also serves to retain the key in the keyway against accidental displacement. I may use short bosses 18 as shown in Fig. 2 or long bosses 18 extending to the sides of the head as shown in Fig. 3.

I have shown and described a shoe and a head of standard type with my invention embodied therein but I do not thereby intend to limit the invention to this particular shoe or head but reserve the right to embody it with other shoes and heads and to make any changes in the form, construction and arrangement of parts that may be necessary or desirable for this or other purposes and within the scope of the following claims:

I claim:

1. The combination of a brake shoe having an attaching lug, a brake head having a recess to receive said lug and a face plate for contact with the back of the shoe, said lug having a key opening therein and said head having a longitudinal keyway, a fastening key extending through said opening and keyway, and means on the inner side of the face plate cooperating with the attaching lug for flexing the key to secure the shoe rigidly on the head and against the face plate.

2. The combination of a brake shoe having an attaching lug, a brake head having a recess to receive said lug and a face plate for contact with the back of the shoe, said lug having a key opening therein and said head having a longitudinal keyway, a fastening key extending through said opening and keyway, and bosses on the inner side of the face plate between the said recess and the ends of the head and cooperating with the attaching lug to flex the key and secure the shoe rigidly on the head and against the face plate.

3. The combination of a brake shoe having an attaching lug, a brake head having a recess to receive said lug and a face plate for contact with the back of the shoe, said lug having a key opening therein and said head having a longitudinal keyway, a fastening key extending tlu'ough said opening and keyway, a boss in the keyway on the inner side of the face plate, and a boss on the opposite side of the keyway cooperating with the attaching lug to flex the key and hold the shoe on the head and retain the key in place.

4. The combination of a brake shoe having an attaching lug, a brake head having a recess to receive said lug and a face plate for contact with the back of the shoe, said lug having a key opening therein and said head having a longitudinal keyway, a fastening key extending through said opening and keyway, bosses on the inner side of the face plate between said recess and the ends of the head, and a boss in the keyway to engage the end portion of the key on the side thereof engaged by the attaching lug for flexing the key and securing the shoe rigidly on the head and against the face plate.

WALLACE B. SUTHERLAND. 

